Flow behavior of high-temperature flue gas in the heat transfer chamber of a pilot-scale coal-water slurry combustion furnace--颗粒学报PARTICUOLOGY

Zhang, Y., Bo, Y., Wu, Y., Wu, X., Huang, Z., Zhou, J., & Cen, K. (2014). Flow behavior of high-temperature flue gas in the heat transfer chamber of a pilot-scale coal-water slurry combustion furnace. Particuology, 17, 114–124. https://doi.org/10.1016/j.partic.2013.07.007

Flow behavior of high-temperature flue gas in the heat transfer chamber of a pilot-scale coal-water slurry combustion furnace

Yanwei Zhang ^a, Yu Bo ^a, Yingchun Wu ^a, Xuecheng Wu ^a *, Zhenyu Huang ^a, Junhu Zhou ^a, Kefa Cen ^a

a State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

10.1016/j.partic.2013.07.007

Volume 17, December 2014, Pages 114-124

Received 3 April 2013, Revised 18 June 2013, Accepted 20 July 2013, Available online 25 September 2013.

E-mail: wuxch@zju.edu.cn

Highlights

• Use of traceable particles in flue gas was viable for 2D PIV in thermal test boiler.

• PIV results were verified by numerical simulation to reflect actual flow in furnaces.

• The excess air ratios only affected the magnitude of the main flow velocity of flue gas.

• The flow field under higher load conditions was more stable due to higher rigidity.

Abstract

The flow characteristics of high-temperature flue gas are important in the heat transfer of coal-water slurry (CWS) combustion furnaces. The flow field of a 250 kg/h vertical-type slag tap cyclone furnace was non-intrusively investigated, using two-dimensional particle-image velocimetry (2D PIV). The method was verified using traceable fly ash particles in high-temperature flue gas. The flow field of the flue gas was analyzed with a time-averaged method, based on which the effects of excess air ratio and loading were investigated. The flue gas separated by a gas separator maintained good rigidity near the furnace wall, rather than eroding the heating surface. Numerical simulations validated the reliability of PIV under the actual circumstances within the furnace. This study provides guidelines for applying 2D PIV in analyzing flue gas in thermal test boilers.

Graphical abstract

Keywords

PIV; CWS; Flow field; High-temperature flue gas; Slag tap cyclone furnace

文章导读